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- Title
Reviews and syntheses: Four Decades of Modeling Methane Cycling in Terrestrial Ecosystems.
- Authors
Xiaofeng Xu; Yuan, Fengming; Hanson, Paul J.; Wullschleger, Stan D.; Thornton, Peter E.; Riley, William J.; Xia Song; Graham, David E.; Song, Changchun; Tian, Hanqin
- Abstract
Over the past four decades, a number of numerical models have been developed to quantify the magnitude, investigate the spatial and temporal variations, and understand the underlying mechanisms and environmental controls of methane (CH4) fluxes within terrestrial ecosystems. These CH4 models are also used for integrating multi-scale CH4 data, such as laboratory-based incubation and molecular analysis, field observational experiments, remote sensing, and aircraft-based measurements across a variety of terrestrial ecosystems. Here we summarize 39 terrestrial CH4 models to characterize their strengths and weaknesses and to suggest a roadmap for future model improvement and application. Our key findings are that: (1) the focus of CH4 models has shifted from theoretical to site- and regional-level applications over the past four decades, (2) large discrepancies exist among models in terms of representing CH4 processes and their environmental controls, and (3) significant data-model and model-model mismatches are partially attributed to different representations of landscape characterization and inundation dynamics. Three areas for future improvements and applications of terrestrial CH4 models are: (1) CH4 models should more explicitly represent the mechanisms underlying land-atmosphere CH4 exchange, with emphasis on improving and validating individual CH4 processes over depth and horizontal space, (2) models should be developed that are capable of simulating CH4 emissions across highly heterogeneous spatial and temporal scales, particularly hot moments and hot spots, and (3) efforts should be invested to develop model benchmarking frameworks that can easily be used for model improvement, evaluation, and integration with data from molecular to global scales.
- Subjects
METHANE cycle (Biogeochemistry); ECOSYSTEMS; FLOODS; REMOTE sensing; ENVIRONMENTAL engineering
- Publication
Biogeosciences Discussions, 2016, Vol 13, Issue 2, p1
- ISSN
1810-6277
- Publication type
Article
- DOI
10.5194/bg-2016-37